{"title":"Analysis of proportional fair scheduling in OFDMA systems with delay QoS constraints","authors":"S. Ahn, Seokwon Lee, Kyungho Kim, D. Hong","doi":"10.1109/APCC.2010.5679776","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679776","url":null,"abstract":"We present an analytical model of throughput-delay tradeoff of the proportional fair scheduling of OFDMA Systems in context of user multiplexing. For this purpose, we propose simple and efficient resource allocation schemes which are based on 2-dimensional resource partitioning in frequency and time domain. Basically, frequency-domain partitioning is determined by degree of frequency diversity and time-domain partitioning is determined by degree of multiplexing which is number of users to be served in a sub-channel of a frame. Our approach is aimed at maximizing the delay constrained throughput by choosing the appropriate degree of multiplexing for a given degree of frequency diversity. We investigate the effect of degree-of-multiplexing and frequency diversity on delay QoS performance of OFDMA system by analyzing the effective capacity, and then develop an approach to finding the optimal degree of multiplexing by the asymptotic approximation.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"63 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124095025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Joint source and relay optimization for parallel MIMO relays using MMSE-DFE receiver","authors":"Apriana Toding, Muhammad R. A. Khandaker, Y. Rong","doi":"10.1109/APCC.2010.5679751","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679751","url":null,"abstract":"In this paper, we study the optimal structure of the source precoding matrix and the relay amplifying matrices for multiple-input multiple-output (MIMO) relay communication systems with parallel relay nodes. In particular, a nonlinear decision feedback equalizer (DFE) is used at the destination node, and the minimal mean-squared error (MMSE) criterion is used to detect the transmitted signal at each stream. We show that the optimal source precoding matrix and the optimal relay amplifying matrices have a beamforming structure. Using such optimal source and relay matrices and the MMSE-DFE receiver, a joint source and relay power loading algorithm is developed to minimize the MSE of the signal waveform estimation. Compared with existing algorithms for parallel MIMO relay networks, the proposed source and relay design together with the MMSE-DFE receiver has a significant improvement in the system bit-error-rate performance.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124385462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Practical training data for support vector machine receiver in a chaos-based CDMA","authors":"J. Kao, S. Berber, V. Kecman","doi":"10.1109/APCC.2010.5679768","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679768","url":null,"abstract":"In this paper, a support vector machine (SVM) receiver is used to recover the transmitted symbol on a multi-user chaos-based code division multiple access system. In comparison to all previous treatments, the SVM receiver here employs practical data for training. This means that the training dataset have been corrupted by both additive noise and multi-user interference in the channel. Simulation results show that the quality of the training data would have an influence on both the complexity and the detection performance of the receiver. All results indicate that if possible, the receiver should always collect training samples from a high signal-to-noise ratio (SNR).","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114939548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fuzzy controller for a dynamic window in elliptic curve cryptography wireless networks for scalar multiplication","authors":"Xu Huang, D. Sharma","doi":"10.1109/APCC.2010.5679992","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679992","url":null,"abstract":"The rapid progress of wireless communications and embedded micro-electro-mechanical systems technologies has made wireless sensor networks (WSN) possible. However, the security of the WSN becomes one of the major concerns in its applications. Elliptic curve cryptography (ECC) prominently provides solid potential for wireless sensor network security due to its small key size and its high security strength. However, there is a urgent need to reduce key calculation time to satisfy the full range of potential applications, in particularly for those applications involved wireless sensor networks (WSN). It is well known that scalar multiplication operation in ECC accounts for about 80% of key calculation time on wireless sensor network motes. In this paper we present a fuzzy controller for a dynamic window sizing to allow the calculation processing to run under optimum conditions by balanced case allocating available RAM and ROM at the sensor node within a wireless sensor network. The whole quality of Service (QoS) is improved, in particular the power consuming is more efficiently. The simulation results showed that the average calculation time decreased by approximately 15% in comparison to traditional algorithms in an ECC wireless sensor network","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114931619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An adaptive and multi-service routing protocol for Wireless Sensor Networks","authors":"Jaydip Sen","doi":"10.1109/APCC.2010.5679779","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679779","url":null,"abstract":"Wireless Sensor Networks (WSNs) are highly distributed networks consisting of a large number of tiny, low-cost, light-weight wireless nodes deployed to monitor an environment or a system. Each node in a WSN consists of three subsystems: the sensor subsystem which senses the environment, the processing subsystem which performs local computations on the sensed data, and the communication subsystem which is responsible for message exchange with neighboring sensor nodes. While an individual sensor node has limited sensing region, processing power, and energy, networking a large number of sensor nodes give rise to a robust, reliable, and accurate sensor network covering a wide region. Thus, routing in WSNs is a very important issue. This paper presents a query-based routing protocol for a WSN that provides different levels of Quality of Service (QoS): energy-efficiency, reliability, low latency and fault-tolerance-under different application scenarios. The algorithm has low computational complexity but can dynamically guarantee different QoS support depending on the requirement of the applications. The novelty of the proposed algorithm is its ability to provide multiple QoS support without reconfiguration and redeployment of the sensor nodes. The algorithm is implemented in network simulator ns-2 and its performance has been evaluated. The results show that the algorithm is more efficient than some of the currently existing routing algorithms for WSNs.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130429861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Taehee Kim, Jung-Hun Kim, Hee Jeong, Myung Kyun Lee
{"title":"Multicopy backup in Wireless Sensor Networks","authors":"Taehee Kim, Jung-Hun Kim, Hee Jeong, Myung Kyun Lee","doi":"10.1109/APCC.2010.5680007","DOIUrl":"https://doi.org/10.1109/APCC.2010.5680007","url":null,"abstract":"In Wireless Sensor Networks (WSNs), each node performs various roles, such as sensor and router. Furthermore, it gathers data from an environment and does not only transfer the data to destinations such as sinks but also store the data in its storage. Therefore, just one node failure can cause malfunctions of various facilities of a WSN. So far, many schemes are proposed to overcome such malfunctions, however, most of them give less consideration to storage-role of nodes, that is, to reserve data safely. Besides, even schemes paying attention to storage-role of nodes are based on impractical assumptions or are suitable to particular cases. In this paper, first, we investigate the data preserving methods of existing schemes and their limitations. Then, we suggest a multiple backup scheme as a solution to overcome such limitations and considering factors for developing a new backup scheme. The proposed scheme can safely preserves data in spite of node failures and consumes reasonable energy. Furthermore, it is suitable well to common WSNs and does not need any impractical assumptions.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127814394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A novel femtocell open access mechanism in the uplink in the CDMA system","authors":"Ben Niu, Yunzhou Li, Xiaofeng Zhong, Shidong Zhou","doi":"10.1109/APCC.2010.5679747","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679747","url":null,"abstract":"The femtocell is a recommended solution to the indoor coverage and throughput problem. In this paper, we study a scenario with only one femtocell access point, one subscriber and N nonsubscribers in CDMA system. Considering the limitation of the backhaul throughput and all the users' benefits, we design a novel femtocell open access mechanism based on the greedy algorithm. The analysis and simulations suggest that our mechanism brings profit to both the subscribers and the nonsubscribers, and increases the system throughput at the same time. The simulations also imply that this flexible mechanism outperforms closed access and hybrid access mechanisms.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127850844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modeling the energy performance of object tracking in Wireless Sensor Network using dual-sink","authors":"Jiehui Chen, Mariam B. Salim, M. Matsumoto","doi":"10.1109/APCC.2010.5679766","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679766","url":null,"abstract":"This paper address the problem of modeling the energy performance by using mobile sinks in Wireless Sensor Networks (WSNs). Mobile sinks can be used to balance energy consumption, however, the frequent location updates of the mobile sinks can lead to data collisions and rapid energy consumption for some specific sensors. In this paper, we explored an optimal barrier coverage based sensor deployment for object tracking WSNs where a dual-sink model was designed by us to evaluate the energy performance of all the static sensors, Static Sink (SS) and Mobile Sink (MS) simultaneously. With the designed MS mobility model that experimentally outperform RM (random movement), PM (peripheral Movement) and SM (Static-base Model), the proposed dual-sink eDSA algorithm was verified by simulations to be more efficient than single static-sink model by approximately half in energy conservation. Moreover, we demonstrate that our results are robust to realistic sensing models and also validate the correctness of our results through extensive simulations.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122932019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluation of Fiber Delay Line buffers with traffic shaping function for optical packet networks","authors":"Takashi Ozu, Tatsuro Takahashi","doi":"10.1109/APCC.2010.5679759","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679759","url":null,"abstract":"This paper proposes and discussed our evaluations of the traffic shaping function incorporated into Fiber Delay Line (FDL) buffers. In Multi-Wavelength Optical Packet Switching (MW-OPS), trunk transmission bandwidth of every network section must be unified to avoid the use of costly format-conversion hardware. Traffic shaping at low traffic sections can reduce loss rate at bottlenecks since packet arrivals become rather constant. FDL buffers with longer common difference of arithmetic-series length can perform the shaping function and enhance network throughput, even though FDL buffer can only provide a discrete amount of delay time and limited buffering capacity. Moreover, this paper evaluates the effectiveness of proposal under various network conditions and the method of self control to achieve the quasi-optimal shaping parameter.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125603444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Channel feedback reduction schemes for opportunistic scheduling in multicast OFDMA systems","authors":"Soomin Ko, Yung-Jun Yoo, B. Lee","doi":"10.1109/APCC.2010.5679772","DOIUrl":"https://doi.org/10.1109/APCC.2010.5679772","url":null,"abstract":"In this paper, we present new feedback reduction schemes that reduce the feedback load needed for opportunistic scheduling in the multicast OFDMA system. Considering the characteristics of the multicast system that the feedback of the user with the poorest channel condition dictates the transmission rate, we designed the proposed schemes such that it can reduce the total feedback load by sacrificing the feedback of the users with good average channel condition. Specifically, the BS divides the users into two disjoint sets, i.e., the set consisting of the users with poor average channel condition and that consisting of the users with good average channel condition, and makes the users in the former set feed back fine-grained condition of the channels while the users in the latter set feed back coarse-grained condition of the channels. Numerical results reveal that the proposed schemes reduce the total feedback load substantially with a marginal loss of the throughput.","PeriodicalId":402292,"journal":{"name":"2010 16th Asia-Pacific Conference on Communications (APCC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130926807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}